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opioid peptides

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opioid peptides (ōˑ·pē·oid pepˑ·tīdz),

n.pl protein molecules found in the body that are responsible for endogenous analgesia and other functions. The three major classes are beta-endorphins, dynorphins, and enkephalins. See also endorphins and enkephalins.

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monoamine-dependent system

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